摘要
对Ti-B19钛合金Φ13mm×40 mm柱型弹丸打靶后的显微组织进行了研究。结果表明:Ti-B19合金的基体组织为β相+均匀弥散的次生α相,高速冲击后组织中有条明显的“白亮带,”即绝热剪切带(ASB)。在ASB和基体的界面处,片状α沿ASB扩展方向产生弯曲变形,ASB内发生相变,形成细小(不超过0.1mm)且呈等轴状的晶粒组织,这是ASB内动态再结晶的结果,ASB发展到一定程度形成微裂纹。可以说,绝热剪切带是材料高速率变形条件下损伤的原因、。
The microstructurc of Ti-B 19 titanium alloy cylindrical bullet with the dimension size of Ф13mm×40mm mm at high speed impacting was investigated.The results show that the matrix microstructure of Ti-B19 titanium alloy is composed of β phase and homogenously dispersed second α phase with lamellar shape. The white shear band in the high speed impacting comperession sample is called as the adiabatic shear band （A S B）. Lamellar α in the interface between the ASB and the matrix produces distortion along the ASB progreation direction. Transformation occurs in the white shear band, then fine and eqiuaxed grain which is no more than 0.1 μm is formed in the ASB because of the results of dynamic recrystallization. With the ASB developing, the micro crack is formed in the ASB, i.e. ASB is the damage reason in the condition of deformation at high speed rate.
出处
《热加工工艺》
CSCD
北大核心
2006年第22期17-19,共3页
Hot Working Technology
基金
总装预研项目(41312020306)
